I’m not 100% certain on the logic. I’ve always found Streaming to have a mind of its own to a certain extent, but on all the articles it refers to memory usage, which I think is relatively unaffected by quality level / graphics setting.
I don’t think StreamingEnabled is necessarily an instant fix for render lag due to it being tied to memory instead of frames per second or anything else, as you can lag for many reasons before running out of memory - I think the main benefit of StreamingEnabled is for low RAM devices like mobiles and tablets.
It’s worth a bit of experimentation with the two radius values though to see how it affects your laptop/desktop players. They were added around the end of 2019: Big Changes to StreamingEnabled